James Dooley interviews Dennis Yu about the dollar a day strategy and how small daily ad spend compounds into serious long term growth. Dennis explains that it is a testing methodology, not a platform hack, where multiple videos are launched with minimal budget to identify high retention winners. They discuss scaling based on watch time, why authentic off the cuff video outperforms polished ads, and how retention spikes can become powerful hooks. Case studies include HVAC SaaS growth and campaigns for major brands. The strategy works because attention is measured first, then conversion is scaled based on proven engagement data.